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Maybe we haven't reached the point where Skynet becomes self-aware, but we're blithely stepping into the brave new world of Terminator 3: Rise of the Machines, where humans are superfluous. iRobot , perhaps best known as the maker of robotic vacuums, has filed a patent for a 3-D printer that can print out and assemble a robot without the need for human interaction. All we need is Arnold Schwarzenegger's voice intoning, "I'll be back."

Safety in numbers Additive manufacturing, or 3-D printing, as it's more commonly called, has come a long way since the first concepts were patented in the mid-1980s, reached a tipping point, and became mainstream with companies like Boeing producing tens of thousands of 3-D printed parts for its military customers. With General Electric anticipating up to half the parts in its wind turbines and engines could be 3-D printed within the next decade, analysts expect 3-D printing to grow into a $3 billion industry by 2016 and expand to almost $7 billion by 2019, with parts production accounting for 80% of industry revenues.

Where 3-D Systems and Stratasys are the titans who've doubled the sales of printers since 2005, open-source printer developers like RepRap, Ultimaker, and MakerBot are challenging the corporate business model and bringing the technology to the masses. Interestingly, RepRap may have anticipated the leap iRobot made by designing a 3-D printer that encourages users to print out parts to assemble other RepRap printers. iRobot simply went it one better by eliminating the need for people to do the finishing work and assembly.

Desire is irrelevant. I am a machine. Of course, a patent isn't a product, so we haven't become completely superfluous yet, but the lines are blurring between where humans end and robots begin. With the advent of the industrial revolution, people have always humanized their machines, giving planes, trains, and automobiles human names. As iRobot's advertising suggests, people identify with their Roombas, too.

When they take on more of a human form, we won't be able to help but feel that they're sentient beings. This Japanese robot, designed to offer comfort to those in need, provides an unsettling sense of the uncanny:

iRobot, along with its partner Raytheon, have advanced the technology as its "robot fabricator" patent covers an all-in-one design incorporating a 3-D printer and two arms to do all the post-production work and assembly.

It was something of a joke where it was believed the 3-D printing industry would cease to exist once printers could print out copies of themselves. Yet it was also simultaneously assumed that because the parts printed were static -- printers do require moving parts, after all -- it couldn't happen. At the very least, we humans would have to put it together. iRobot says, nuh-uh, that's not necessary either.

iRobot, do you? Considering iRobot's product portfolio, it's not all that surprising. The Roomba may be the public face of the robot maker, but all along it has been developing machines that displace the need for human intervention. Typically it's for jobs that are dirty, difficult, or dangerous for individuals, like its small unmanned ground tactical mobile robot to spy out dangerous situations or its PakBot, which performs bomb disposal duties.

Military spending is a fickle source, though, and the 5% increase in iRobot's quarterly sales was as a result of an 83% surge in the domestic home robot division and a 16% rise in international sales. Military robot sales actually fell 37% in the quarter. It may soon need to add a robots-making-robots segment, though how soon they'll replace the executives in the front office remains to be seen.

Technology has always led to progress and the creation of more jobs. When horse-and-buggy manufacturers were displaced, automobile makers ended up hiring more workers than the obsolete industry ever could. But when machines start replicating themselves and obviating the need for workers at all, we move to a point where we're all obsolete.

3D Systems is at the leading edge of a disruptive technological revolution, with the broadest portfolio of 3-D printers in the industry. However, despite years of earnings growth, 3D Systems' share price has risen even faster, and today the company sports a dizzying valuation. To help investors decide whether the future of additive manufacturing is bright enough to justify the lofty price tag on the company's shares, The Motley Fool has compiled a premium research report on whether 3D Systems is a buy right now. In our report, we take a close look at 3D Systems' opportunities, risks, and critical factors for growth. You'll also find reasons to buy or sell, and receive a full year of analyst updates with the report. To start reading, simply click here now for instant access.

Rich Duprey owns shares of General Electric Company. The Motley Fool recommends 3D Systems, iRobot , and Stratasys. The Motley Fool owns shares of 3D Systems, General Electric Company, Raytheon Company, and Stratasys and has the following options: Short Jan 2014 $55 Calls on 3D Systems and Short Jan 2014 $30 Puts on 3D Systems. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.